<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=
    , initial-scale=1.0">
    <title>行高</title>
    <style>
        p{
            font-size: 20px;
            /* line-height:30px */
            /* 行高值是数字，表示是当前标签字体大小的倍数 */
            line-height: 2;
        }
    </style>
</head>
<body>
    <p>dddddddddddddddddd
        ddddddddddddddddddddddddd
        ddddddddddddddddddddddddddddddddddddddddddddddddddd</p>
</body>
</html>